Java 8 确实写起来，代码量确实少很多
```
List<String> collected = Stream.of("a", "b", "c").collect(Collectors.toList());
List<String> toUpperCase = Stream.of("a", "b", "hello").map(string -> string.toUpperCase()).collect(Collectors.toList());
List<Integer> together = Stream.of(asList(1,2), asList(3,4)).flatMap(numbers -> numbers.stream()).collect(Collectors.toList());
```
```
List<String> collected = Stream.of("a", "b", "c").collect(Collectors.toList());
List<String> toUpperCase = Stream.of("a", "b", "hello").map(string -> string.toUpperCase()).collect(Collectors.toList());
List<Integer> together = Stream.of(asList(1,2), asList(3,4)).flatMap(numbers -> numbers.stream()).collect(Collectors.toList());
```
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